package org.ws.kardex.servlets.inventory;

import com.google.appengine.api.users.UserServiceFactory;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import javax.jdo.PersistenceManager;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.ws.kardex.gae.PMF;
import org.ws.kardex.model.Inventory;
import org.ws.kardex.utils.Const;

/**
 *
 * @author gerardino
 */
public class Save extends HttpServlet {

    private static final String P_INVENTORY_NAME = "iName";
    
    
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        
        String name = request.getParameter(P_INVENTORY_NAME);
        Inventory i = new Inventory(name);
        LinkedList<String> messages = new LinkedList<String>();
        
        if (i.getName() == null){
            i.setName("");
        }
        
        if (i.getName().length() < 4){
            messages.add("Nombre inv&aacute;lido");
        } else {
            PersistenceManager pm = PMF.pm;
            String user = UserServiceFactory.getUserService().getCurrentUser().getNickname();
            
            List<Inventory> known = 
                    (List<Inventory>)pm
                    .newQuery("select from " + Inventory.class.getName() + " \n"
                    + " where owner == '"+ user +"' \n"
                    + " && name == '"+ name +"'")
                    .execute();

            if (known.isEmpty()){
                i.setOwner(user);
                try {
                    pm.makePersistent(i);
                } catch (Exception e){
                    messages.add("No se ha podido crear el inventario " + e.getMessage());
                } 
            } else {
                messages.add("Ya existe un inventario con ese nombre.");
            }
        } 

        String destino = "";
        if (messages.isEmpty()){
            destino = "/Inventory/view?id=" + i.getId().getId();
        } else {
            request.setAttribute("i", i);
            destino = "/Inventory/edit.jsp";
        }
        
        request.setAttribute(Const.MESSAGE, messages);
        request.getRequestDispatcher(destino).forward(request, response);
        
        
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
